help2002

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help2002

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UWA week 41 (2nd semester, week 11) ↓

2nd project Question about page tables (both)

12:20pm Thu 10th Oct, Joshua N.

ANONYMOUS wrote:

> Hi, just making sure I understand correctly/ > In reality a page table for each process will be stored in RAM, however in this project only page frames can be stored on RAM - so I am assuming that we can use an array completely separate from main memory and secondary memory to store the page tables?

Yes.

> Also, I am confused what the difference between local and global LRU is, can someone explain?

Global means evict the page in RAM with the lowest "last_accessed" time. Local means evict the page from the same process in RAM with the lowest "last_accessed" time (e.g. If you are loading process 0 onto RAM and RAM is full and RAM contains other pages of process 0, then evict the page of process 0 with the lowest "last_accessed" time to make room for the new page on process 0).

> Thanks